Bound States in the Continuum Realized in the One-Dimensional Two-Particle Hubbard Model with an Impurity

Abstract

We report a bound state of the one-dimensional two-particle (bosonic or fermionic) Hubbard model with an impurity potential. This state has the Bethe-ansatz form, although the model is nonintegrable. Moreover, for a wide region in parameter space, its energy is located in the continuum band. A remarkable advantage of this state with respect to similar states in other systems is the simple analytical form of the wave function and eigenvalue. This state can be tuned in and out of the continuum continuously.

A semi-exactly solvable model (half of the eigenstates are in the Bethe form)

References in corpus (2)

• Repulsively bound atom pairs in an optical lattice
• Quasi-bound states in continuum

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